The Kase Sony Alpha ND32 Clip-In Filter provides 5 stops of reduction, which allows for better control of aperture and shutter speeds to create the required level of motion blur or depth of field. It is useful if you are looking to reduce the amount of light captured in your pictures. You can also use it to a great effect to increase your exposure times for pictures, allowing for light trails or smooth water for instance. This compact filter is engineered from B270 optical glass and features premium-quality nanocoating to ensure exceptional image quality. Installation is easy and quick, and removing the filter is also simplified using the supplied removal tool. The filter also provides added sensor protection due to its oil-resistant and waterproof coatings. Moreover, the supplied matte black shading fabric helps to reduce the possibility of stray lens flare.